Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ccd8e0b066769dcf826761e2a2cdaf0bc1df5882718247a66e9f1d071b8772' 
  AND token = 'aRcEPkBeFWZ5tRIvfHrIGQm8LIYDLpkxxDy/dcwSwjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}